Which reagent forms a crystalline osazone derivative upon reaction with glucose?

The correct observation in the following reactions is:
$\text{Sucrose}$ $\xrightarrow[\text{Cleavage (Hydrolysis)}]{\text{Glycosidic bond}} A + B$ $\xrightarrow[\text{reagent}]{\text{Seliwanoff's}} ?$

$C_2$-epimer of $D$-Glucose is

Identify the trisaccharide from the following.

The structure of $\alpha-D$-Fructofuranose is

Which $L$-sugar on oxidation with $HNO_3$ gives an optically active dibasic acid ($2$ $COOH$ groups)?